Abstract
In this paper, we numerically investigate the lateral leakage loss
behavior for TM-like modes in silicon-on-insulator ridge
waveguides. If the waveguide width is set to satisfy a
certain condition, the leakage loss of the TM-like mode leads to be a
minimum. When utilizing TM-like modes in the ridge
waveguides, it is the main drawback that the tolerance
for the variations in the waveguide width and operation wavelength is too
small. In this paper, we propose a novel ridge waveguide structure, where a
dimple is introduced at the ridge region. It is shown from the
finite-element analysis that the ridge waveguide with a dimple is both low
loss and fabrication tolerant.
© 2009 IEEE
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